1 /* 2 * Copyright (C) 2016 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "msm_drv.h" 19 #include "msm_gem.h" 20 #include "msm_mmu.h" 21 22 void 23 msm_gem_unmap_vma(struct msm_gem_address_space *aspace, 24 struct msm_gem_vma *vma, struct sg_table *sgt) 25 { 26 if (!vma->iova) 27 return; 28 29 if (aspace->mmu) { 30 unsigned size = vma->node.size << PAGE_SHIFT; 31 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size); 32 } 33 34 drm_mm_remove_node(&vma->node); 35 36 vma->iova = 0; 37 } 38 39 int 40 msm_gem_map_vma(struct msm_gem_address_space *aspace, 41 struct msm_gem_vma *vma, struct sg_table *sgt, int npages) 42 { 43 int ret; 44 45 if (WARN_ON(drm_mm_node_allocated(&vma->node))) 46 return 0; 47 48 ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages); 49 if (ret) 50 return ret; 51 52 vma->iova = vma->node.start << PAGE_SHIFT; 53 54 if (aspace->mmu) { 55 unsigned size = npages << PAGE_SHIFT; 56 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt, 57 size, IOMMU_READ | IOMMU_WRITE); 58 } 59 60 return ret; 61 } 62 63 void 64 msm_gem_address_space_destroy(struct msm_gem_address_space *aspace) 65 { 66 drm_mm_takedown(&aspace->mm); 67 if (aspace->mmu) 68 aspace->mmu->funcs->destroy(aspace->mmu); 69 kfree(aspace); 70 } 71 72 struct msm_gem_address_space * 73 msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain, 74 const char *name) 75 { 76 struct msm_gem_address_space *aspace; 77 78 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL); 79 if (!aspace) 80 return ERR_PTR(-ENOMEM); 81 82 aspace->name = name; 83 aspace->mmu = msm_iommu_new(dev, domain); 84 85 drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT), 86 (domain->geometry.aperture_end >> PAGE_SHIFT) - 1); 87 88 return aspace; 89 } 90